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2 Rotation vs RevolutionRotation: an object spins about an internal axisThe Earth rotates on its axis once every 24 hoursRevolution: movement around an external axisThe earth revolves around the sun once every days (1 year)

3 Rotational SpeedPeriod: time to complete one full rotation; measured in secondsFrequency: rotations per second (minute, hour); measured in hertz (sec-1) or rpmRotational speed is the same thing as frequency

4 Centripetal ForceLaw Of Inertia: objects naturally move in straight pathsCentripetal Force is a force applied at 90o to the path of an object causing it to curve (move in a circle)Force and acceleration at right angles to velocity